Multiple drilling mechanism



March 6, 1928. r 1,661,179

, C. JOBST MULTIPLE DRILLING MECHANISM Filed Feb. 1925 4 5 Sheets-Sheet IN VEN TOR. k [DIVE/ 0 \j fl'j 7' BY 91W MM 161 4 ATTORNEY 5 March 6, 1928.

C. JOBST MULTIPLE DRILLING MECHANISM Filed Feb. 19. 1925 5 Sheets-Sheet 2 INVENTOR. (Me/9p J50: T I

BY I I ATTORNEY.

March 6, 1928.

C. JOBST MULTIPLE DRILLING MECHANISM 5 Sheets-Sheet 3 Filed Feb. 1925 I'l'l March 6, 1928.

C. JOBST MULTI PLE DRILLING MECHAN I SM Filed Feb. 19, 1925 5 Sheets-Sheet 4 1 INVENTOR. [an B90 Jbasr gr/mm HQ L ATTORNEYS March 6, 1928.

- 1,661,179 c. JOBST MULTIPLE DRILLING MECHANISM Filed Feb. 19 5 Sheets-Sheet 5 I 4-| T3112? 31'' ll] J M i "Z5 Z M mama MM. 8 4. ATTORNEYJ Patented Mar. 6, 1928;

UNITED STATES pnrsur oF cE- f 001mm) JOBST, or TOLEDO, onro, assreivoa we ran To mi AUTOMATIC. mess momma- COMPANY, orrorsno, 01110, A. coaroaa'rron or onro.

MULTIPLE DRILLING mscnmrsm.

Application filed February 19,1925. serial no. 10,289.

It is the object of the invention to obtain a Construction of multiple drilling machine which is capable of simultaneously drilling groups of closely spaced holes of small diameter. It is a further-object to provide for exchangeable drilling units so that either the grouping or the size of the holes maybe varied. Still another featureof the invention is the means for successively feeding the work to be drilled into operative relation withthe drilling unit. The invention there-f fore consists in various features of construction as hereinafter set forth.

In thedrawings: I

Figure 1 is a sectional elevation of the machine; a j

Figure 2 is a vertical section in a planeat right angles to Figure 1 v Figure 3 is a rear elevatien showing the work feeding and registering mechanism} Figure 4 is a sectional plan view of Figure'3; I Figures 5 and 6 are views similar to por tions ofFigures 1 and 2. p l Figure 7 is a planview of themachine;

Figures 8, 9 and 10 are detailed views of the index wheel. I

While my machine may be used for various kinds of work, I have specifically illustrated and will describe its application to the drilling of tooth brush backs for the reception of the bristle'tufts. For such use the holes to be bored are of relatively small diameter and are grouped in rowsfvarying styles and sizes of brushes require variation in the grouping and size ofholes. Thus it would be diflicult, if not impossible, to perform such work upon any construction of machine having individual spindle chucks for holding separate drillsfl With my improved construction, however, such work can be easily performed and 3 changes in the grouping or size of holes may be made with small labor and expense. 7

In general construction my improved machine comprises a suitable frame 1 having iournaled therein thedrive shaft 2 connected by bevel gears 3 and 4 with the p vertical driven shaft 5; Abovethis shaft 5 there is somewhat in spacing. Moreover different arranged a cross headfi having journaled and at the sameangular speed through the medium of intermeshing gear wheels 8 one of which is inaligninent with the shaft 5 and is coupled therewith through the me: dium of the clutch 9.

The upperrends ofthe spindles 7 are pro vided with upwardly projecting eccentric pins 10, all of which are in the same eccentric relation to their respective spindles. 11 and'12 are plates apertured to form bearings for engaging the eccentric pins'jlO, which impart to said plates an oscillatory movement. The upperplate 11" is apertured to correspond to the pattern or arrangement of holes which are tobe simultaneously drilled, but the lower plate 12 is imperforate and is preferably supportedg'for'v freedom in oscillation upon a ball thrustbearing 13. Above the plates 11 and 12 are oneor more plates 14, which are apertured tocorrespondwith the apertures in theplate 11 and form guides for the drills. The plates 14 are stationary and are held in proper relation to the'plates 11 and 12' byengaging studs or pins'15projecting upward frointhe cross head 6. These pins are threaded at their upper ends for the engagement of clamping nuts 16 by means of which the plates 14are secured in position; spacers 17 being interposed between the plates. Above the plates 14 thereis preferably a third plate 18 which is also apertur'ed in exact registration with the apertures-in the plates 14 and forms a guide for the points of the drills. The plate 18 is yieldably supported in relation to the lates 14 by engaging headed pins 19 slida le in the plate 14 and resiliently pressed upward by the springs E20. As shown, the pins 19 are hollow and the springs are housed therewithin. With the construction as just described, it will "be apparent that the rotation of the spindles 7 will impart an oscillatory movement to the plates 11 and 12, every point in whichwill traverse a circular orbit of the same radius as the eccentricity of. the pins 10.. The drills 21 which engage the aper tar s in the plates 14 and is are provided with offset downward extensions or cranks 22 and these are of a radius corresponding to the radius or eccentricity of the pins 15. Thus the crank 22 may be engaged with the apertures in the plate 11 and in the oscillation of said plate will be revolved around the axes of their respective drills, imparting to the latter a rotary movement. The end thrust on "the drills istaken by the plate 12 and as this is supportedon the anti-friction ball bearing 13, it will not interfere with the free oscillation.

In the operation of the machine the work is pressed downward upon the plate 18, displacing thosame and thereby permitting the drills to'enter. When the pressure is released, the springs 20 will again raise the plate 18, thereby stripping the work from the drills, the chips being removed by air fromia blower nozzle 27.

To ifeed successive pieces of'work into registration with the drills and to automatically perform the operation. of depressing and releasing the work, I preferably provide the following construction: Slidably secured within the frame 1 are vertically extending rods23,whichat their upper ends have connected thereto the cross head 24; and-at their lower ends the cross head 25. Springs 26 sleeved upon the .rods23 and resting upon a portion of the frame 1 serve to yieldably movethe rods and cross heads upward. The drive shaft 2 is connected by a step-down train of gearingQS, 29, 30 and 31 to a shaft .32 having mounted thereon the cams 32 and32". These cams engage roller bearings 33 and 33%.secured to the cross head-25 and respectively below and above the cams 32* and 32 The arrangement is such that once in each cycle-of the cam the cross head 25- will be first depressed and then raised,

reciprocating :thenrods 23 and cross head 24-.

Upon the (31305811631124 is mounted a work holder of any suitable construction. As shown in Figure 1, this holder is in the form of a rotary drum 34: having peripheral clamps 35 for the articles to be drilled,such for instance as tooth brush handles. Connected with the drum 34 is an index wheel 36anda'ratohet wheel .37, which latter is rotative'l-y actuatedin the upward and clownward "movement of the cross head by pawls 38 and .39. Both of these pawls are-pivotally mounted on the frame 1, but the pawl 39 isfprovided with a yielding support formed by the spring 40. The pawl 38 has connected thereto a cam lug 41 which, during the upward movement of the cross-head, will engage ahearing a2 on a detent d3 cooperating with the index wheel 36, thereby releasing said detent topermit rotation of the wheel. The arrangement is such that during the upward movementof the cross head after thedrills have been withdrawn from the work and during the downward movement of said cross head s before the drills engage the work, motion is communi cated to the ratchet wheel through the medium of the pawls 38 and 39 sufficient to rotate said wheel. one or more notches of the index wheel. This will successively br ng the brush backs in the clamps 35 upon the periphery of the drum into registration with the multiple drills, holding each piece in this position during the drilling operation.

It is desirable to accurately determine the depth to which the drills enter the work.

This may be accomplished by an adjustment of the cross head 24 upon the rods 23. As shown, this adjustment is effected by threading the upper ends of the rods and engaging therewith nuts 45. These maybe calibrated so that by turning to certain indications the cross head may be raised'or lowered a 'predetermined amount, which will correspond ingly alter the depth to which the drills enter the work. i

What I claim as my invention is: I

1. In a multiple drill, the combination of a plurality of parallelly arranged plates hav ing drill receiving apertures therein arranged in a predetermined pattern,the same in each plate, of drills engaging the apertures of one of said plates and provided with similar offset crank portions engaging the corresponding apertures of another of said plates, an imperforate plate adjacent to the crank receiving plate and forminga thrust I bearing for the ends of said crank portions, means for simultaneously: oscillating said crank receiving plate and imperforate plate tosimultaneously rotate all'of said drills, a fixedbed for supporting said plates and an anti-friction bearing between said bed and head, means for impartinga driving'to'rque' to eachof said shafts, an osclllating member j having-apertures for engaging said cranks,

an anti-friction bearing between said oscillating member and said crosshead, perforated pattern plates parallel to said cro'sshead and spaced from the same, drills engagingsaid perforations, each having an integral crank engaging said oscillating member and'means for removably securing said pattern plates to said crosshead permitting the removal of said oscillating drills as, a unit.

'3. In a multiple drill, with "a fixed member, of a. pair of vertical member, pattern plates. and

shafts journaled in said fixed; member, each i havinga crank pin" projectingtherefrom, an oscillating member having-apertures for en? lee the combination 7 aging said crank pins, an anti-friction aring between said oscillating member and i saidfixed member, perforated pattern plates parallel to said fixed member and spaced 5 from the same, drills engaging said perfo rations, each having an inte ral crank engaging said oscillating mem r, a pair of 

